A drip irrigation belt extrusion double filtration system

Abstract

The present invention relates to the technical field of drip irrigation tape extrusion filtration, and in particular to a double filtration system for drip irrigation tape extrusion; the system comprises a primary filtration unit for coarsely filtering melted drip irrigation tape raw materials, and a secondary filtration unit for finely filtering the melted drip irrigation tape raw materials; the system also comprises a heating device for heating various components in the system; after the drip irrigation tape raw materials are heated and melted by a melting furnace, they are filtered in sequence by the primary filtration unit and the secondary filtration unit before passing through a water-cooled extrusion head; the system provides a double filtration system with different filtration gaps to extend the service life of the filter screen, reduce the number of mid-production stoppages, and thus improve production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of drip irrigation belt extrusion filtration, in particular to a drip irrigation belt extrusion double filtration system. Background Art

[0002] Drip irrigation tape is made of soft plastic processed into a thin tube with penetration holes processed on the thin tube. The water in the thin tube is transported to the roots of crops through the penetration holes for local irrigation. This process is uniform and slow, which can achieve precise irrigation and the water utilization rate is higher than the traditional method.

[0003] At present, the process of drip irrigation tape molding is that the material is first molten in a melting furnace, and the molten material is extruded from a water-cooled extruder through a filter. Because the material is made from recycled plastic, it contains impurities. When the material passes through a microporous filter, the impurities will be blocked by the filter and remain on the filter. This can ensure the purity and quality of the recycled pellets on the one hand, and protect the water-cooled extruder head on the other hand. When a large amount of impurities accumulate on the filter, generally about 4 hours, the system will be blocked, affecting production. Therefore, it is necessary to time the filter. The traditional approach is to shut down the extruder, disassemble the extruder, remove the filter, replace it with a new filter, and then assemble the extruder and start production. Therefore, production requires frequent shutdowns and restarts. Long downtime of the production line will also affect the production efficiency of the enterprise. Based on this technical background, the inventors designed a double filtration system for drip irrigation tape extrusion. Summary of the Invention

[0004] In order to solve the technical problems in the prior art such as the frequent shutdown and replacement of the filter screen of the drip irrigation tape extruder after clogging, the present invention provides a double filtration system for drip irrigation tape extrusion, which extends the service life of the filter screen and reduces the number of mid-stops in a single production by setting up a double filtration system with different filtration gaps, thereby improving production efficiency.

[0005] The technical solution used in the present invention is as follows: a drip irrigation tape extrusion double filtration system, characterized in that it includes a primary filtration unit for coarsely filtering the melted drip irrigation tape raw material, and a secondary filtration unit for finely filtering the melted drip irrigation tape raw material; it also includes a heating device for heating various components in the system; after the drip irrigation tape raw material is heated and melted by the melting furnace, it is filtered in sequence by the primary filtration unit and the secondary filtration unit and then passes through a water-cooled extrusion head.

[0006] Furthermore, the primary filter unit includes a filter tube and a filter element assembly arranged in the filter tube. One side of the filter tube is connected to the driving device through an auxiliary tube. The driving device is used to connect to the melting furnace and drive the material inside the melt to flow to the primary filter unit; the other side of the filter tube is connected to the cold extrusion head through the secondary filter unit water.

[0007] Furthermore, two primary filter units are provided, which are respectively connected to the two ends of the inverter device, and the third end of the inverter device is connected to the secondary filter unit; the other sides of the two first filter units are respectively connected to the driving device through auxiliary pipes, the two driving devices are connected to the two sides of the tee pipe, and the third end of the tee pipe is connected to the melting furnace; the primary filter unit includes a filter tube and a filter element assembly arranged in the filter tube.

[0008] Furthermore, the inverter device includes an inverter cylinder, an outlet end is formed in the middle of the inverter cylinder, and is used to connect with the secondary filter unit; both sides of the inverter cylinder are respectively connected with the primary filter unit; a sealing block is slidably connected inside the inverter cylinder; stop rings are vertically provided on both sides of the inverter cylinder; the sealing block is smaller than the inner diameter of the inverter cylinder; a sliding column is horizontally provided inside the inverter cylinder, and a notch corresponding to the sliding column is provided on the sealing block, and the sealing block is limited in the sliding of the inverter cylinder through the sliding cooperation between the notch and the sliding column

[0009] Optionally, two sealing blocks are provided, and the two sealing blocks are connected by a spring.

[0010] Furthermore, a limiting sliding shaft is relatively provided in the auxiliary tube, and the limiting slider slides in cooperation with the limiting sliding shaft. The limiting slider extends out of the auxiliary tube through an extension column and is fixed to the connecting head; the connecting head and the filter element assembly are detachably matched; the filter element assembly is linked to the limiting slider, and when pulled out, the limiting slider seals the end of the auxiliary tube, and the internal part is connected when the filter element assembly is pushed in as a whole.

[0011] Furthermore, the secondary filtration unit includes a filter chamber and a filter plate located on the upper side of the filter chamber and slidingly engaged with the filter chamber; the secondary filter screen is detachably engaged with the filter plate; a support frame is vertically provided on the filter chamber, and a push rod is provided on the support frame; the push head of the push rod is fixed to the filter plate, and the height position of the support frame is changed by controlling the extension and shortening of the push rod.

[0012] Preferably, a metering pump is provided between the primary filtration unit and the secondary filtration unit, and the metering pump is electrically connected to the control system. A first pressure sensor for detecting the pressure of the water-cooled extrusion head is provided between the secondary filtration unit and the water-cooled extrusion head; the first pressure sensor is electrically connected to the control system, and after transmitting a pressure signal to the control system, the metering pump is adaptively adjusted by the control system to maintain a balanced pressure in the water-cooled extrusion head.

[0013] Furthermore, a second pressure sensor for detecting the primary filter is provided on the filter tube; the second pressure sensor and the drive device are electrically connected to the control system respectively; when the second pressure sensor detects that the pressure is greater than the threshold, the drive device controls the drive device on the working side to turn off and the drive device on the other side to turn on.

[0014] The present invention also has the following characteristics: by setting up a primary filter unit and a secondary filter unit, impurities are diverted; the same number of large particles and small particles of impurities; the filter screen of the existing structure has been blocked, and most of the large particles of impurities are blocked by the primary filter unit of the present invention, and a small part of the small particles of impurities are blocked by the secondary filter unit after passing through the primary filter unit. Both layers of the filter unit are not blocked, thereby increasing the interval for replacing the filter screen and reducing the number of mid-term shutdowns in a single production.

[0015] At the same time, the present application is also provided with an inverter device, and the third end of the inverter device is connected to the secondary filter unit; the other sides of the two first filter units are respectively connected to the driving device through auxiliary pipes, and the two driving devices are connected to the two sides of the tee pipe, and the third end of the tee pipe is connected to the melting furnace; in this way, the driving device on one side works first, and the driving device generates a linkage with the inverter device, and the inverter device is used to seal the side where the driving device is not started; when the primary filter unit is clogged after 6 hours of use, the driving device on the clogged side is closed, and the driving device on the other side is turned on at the same time, and the driving device on the other side is linked to the inverter device to seal the clogged side; at this time, the primary filter unit on the clogged side can be opened for replacement, and the use time of the primary filter unit is extended by the linkage between the driving device and the inverter device, thereby avoiding mid-term shutdown of a single production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention Figure 1 .

[0017] Figure 2 This is a schematic diagram of the overall structure of the present invention Figure 2 .

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the primary filtration unit and the secondary filtration unit of the present invention.

[0019] Figure 4 It is a schematic diagram of the extension column structure of the present invention.

[0020] Figure 5 It is a schematic structural diagram of the limit slider of the present invention.

[0021] Figure 6 It is a schematic structural diagram of the connector of the present invention.

[0022] Figure 7 It is a schematic diagram of the connection block structure of the present invention.

[0023] Figure 8 It is a schematic structural diagram of the filter head of the present invention.

[0024] Figure 9 It is a schematic diagram of the position of the metering pump of the present invention.

[0025] Figure 10 It is a schematic diagram of the cross-sectional structure of the inverter device of the present invention.

[0026] Figure 11 It is a schematic structural diagram of the sealing block of the present invention.

[0027] Figure 12 It is a schematic diagram of the filter cavity structure of the present invention.

[0028] Figure 13 It is a schematic diagram of the position of the push rod of the present invention.

[0029] Figure 14 It is a circuit connection diagram of the present invention.

[0030] In the figure, 1. primary filter unit; 2. secondary filter unit; 3. water-cooled extruder head; 4. filter tube; 5. auxiliary tube; 6. drive device; 7. inverter device; 8. tee pipe; 9. melting furnace; 10. inverter cylinder; 11. sealing block; 12. stop ring; 13. slide column; 14. notch; 15. inlet pipe; 16. outlet pipe; 17. connecting block; 18. mounting groove; 19. filter head; 20. primary filter; 21. filter bracket; 22. guide port; 23. limit slide shaft; 24. limit slide block; 25. extension column; 26. connector; 27. connecting pipe; 28. filter chamber; 29. ​​filter plate; 30. support frame; 31. push rod; 32. secondary filter; 33. metering pump; 34. control system; 35. first pressure sensor; 36. second pressure sensor; 37. heating device; 38. spring. DETAILED DESCRIPTION

[0031] To facilitate those skilled in the art to understand the present invention, specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on specific circumstances.

[0033] At present, the process of forming the drip irrigation tape is that the material is first formed into a molten state in the melting furnace 9, and the molten material is extruded from the water-cooled extrusion head 3 through the filter screen. Because the material is made of recycled plastic, it contains impurities. When the material passes through the filter screen, the impurities will be blocked by the filter screen and remain on the filter screen. Generally, the entire machine needs to be shut down to replace the filter screen after about 4 hours. Therefore, the problem of frequent replacement of the filter screen in the production of drip irrigation tapes causing downtime is a problem that needs to be solved urgently. Figure 1 As shown, the present invention provides a double filtration system for drip irrigation tape extrusion, comprising a primary filtration unit 1 for coarsely filtering the melted drip irrigation tape raw material, and a secondary filtration unit 2 for finely filtering the melted drip irrigation tape raw material; further comprising a heating device 37 for heating various components in the system to melt the material; after the drip irrigation tape raw material is heated and melted by a melting furnace 9, it is filtered in sequence by the primary filtration unit 1 and the secondary filtration unit 2 and then extruded through a water-cooled extrusion head 3; at the same time, it is ensured that the filtration gap of the primary filtration unit 1 is larger than that of the secondary filtration unit 2; the impurities contained in the recycled drip irrigation tape raw material are mostly large particles, A small part is small particle impurities; when the melted material passes through the primary filter unit 1, the large particle impurities therein are blocked by the primary filter unit 1, and a small part of the small particle impurities after the primary filtration are blocked by the secondary filter unit 2, thus diverting the impurities; that is, the same number of large and small particle impurities; the filter screen of the existing structure has been clogged, and most of the large particle impurities are blocked by the primary filter unit 1 of the present invention, and a small part of the small particle impurities are blocked by the secondary filter unit 2 after passing through the primary filter unit 1, and the two layers of filter units are not blocked, thereby increasing the interval for replacing the filter screen and reducing the number of mid-term shutdowns in a single production.

[0034] At the same time, there are two sealing blocks 11, which are connected by a spring 38. The spring 38 is a buffer pressure to prevent the sealing block 11 from being broken by multiple reversing. It also compensates for the hydraulic pressure to avoid excessive liquid pressure on the other side during reversing.

[0035] like Figure 3 As shown, the above-mentioned primary filter unit 1 includes a filter tube 4 and a filter element assembly arranged in the filter tube 4. One side of the filter tube 4 is connected to the driving device 6 through an auxiliary tube 5. The driving device 6 is used to connect to the melting furnace 9 and drive the material inside the melt to flow to the primary filter unit 1. It can be a rotor pump and has a certain sealing performance when it stops working; the other side of the filter tube 4 is connected to the cold extrusion head through the secondary filter unit 2 water.

[0036] When the above scheme was implemented, it was found that since most of the impurities contained in the recycled drip irrigation tape raw materials were large particles and a small part were small particles, the primary filter unit 1 was clogged after about 6 hours of use, and the secondary filter unit 2 could be used for about 14 hours; as another embodiment, the primary filter unit 1 is provided with two, which are respectively connected to the two ends of the inverter device 7, and the third end of the inverter device 7 is connected to the secondary filter unit 2; the other sides of the two first filter units are respectively connected to the driving device 6 through the auxiliary pipe 5, and the two driving devices 6 are connected to the two sides of the tee pipe 8, and the third end of the tee pipe 8 is connected to the melting furnace 9; in this way, the driving device on one side is connected to the tee pipe 8. Device 6 works first, and the drive device 6 is linked to the inverter device 7, and the inverter device 7 is used to seal the side of the drive device 6 that is not started; when the primary filter unit 1 is blocked after 6 hours of use, the drive device 6 on the blocked side is closed, and the drive device 6 on the other side is opened at the same time, and the drive device 6 on the other side is linked to the inverter device 7 to seal the blocked side; at this time, the primary filter unit 1 on the blocked side can be opened for replacement. The linkage between the drive device 6 and the inverter device 7 extends the use time of the primary filter unit 1. The single production is currently about 12 hours, so the midway shutdown of a single production can be avoided.

[0037] like Figure 10 As shown, the inverter device 7 includes an inverter cylinder 10, with an outlet end formed in the middle of the inverter cylinder 10 for connecting to the secondary filter unit 2; the two sides of the inverter cylinder 10 are respectively connected to the primary filter unit 1; a sealing block 11 is slidably connected inside the inverter cylinder 10; stop rings 12 are vertically provided on both sides of the inverter cylinder 10; the sealing block 11 is smaller than the inner diameter of the inverter cylinder 10; a sliding column 13 is horizontally provided in the inverter cylinder 10, and a notch 14 corresponding to the sliding column 13 is provided on the sealing block 11. The sealing block 11 is slidably limited in the inverter cylinder 10 through the sliding cooperation between the notch 14 and the sliding column 13; when the driving device 6 on one side is started, driven by the molten raw material, the sealing block 11 moves to the other side to cooperate with the stop ring 12 to seal the unstarted side of the driving device 6; when the driving device 6 on one side is closed, the driving device 6 on the other side is opened at the same time, and the sealing block 11 moves to the other side to cooperate with the stop ring 12 to seal, thereby ensuring a large flow through while slowing down liquid hammer and increasing the reliability of the structure.

[0038] As shown in the figure, the filter tube 4 includes an inlet tube 15 connected to the auxiliary tube 5 and a discharge tube 16 perpendicular to the inlet tube 15. The inlet tube 15 and the discharge tube 16 are connected through a connecting block 17. A tapered mounting groove 18 corresponding to the inlet tube 15 is provided on the connecting block 17, and the discharge tube 16 is connected to the side of the mounting groove 18. The filter element assembly includes a filter head 19, a primary filter screen 20 and a filter screen bracket 21. The filter head 19 is a tapered structure corresponding to the mounting groove 18, and its side has a guide port 22 corresponding to the discharge tube 16. The filter screen bracket 21 is provided on the side corresponding to the filter head 19 and the inlet tube 15. The primary filter screen 20 is connected to the filter head 19. The auxiliary tube 5 has an annular structure and is snap-fitted onto the filter bracket 21. A connecting tube 27 is provided in the filter bracket 21. A limiting slide shaft 23 is relatively provided in the auxiliary tube 5. The limiting slider 24 slides with the limiting slide shaft 23. The limiting slider 24 extends out of the auxiliary tube 5 and is fixed to the connecting head 26 through the extension column 25. The connecting head 26 is threadedly fitted with the connecting tube 27 to position and limit the primary filter 20. At this time, the filter element assembly is linked with the limiting slider 24. When it is pulled out, the limiting slider 24 seals the end of the auxiliary tube 5. When the filter element assembly is pushed in as a whole, the interior is conductive and is sealed by the sealing plug threadedly fitting with the mounting groove 18.

[0039] like Figure 12 As shown, the secondary filter unit 2 of the present application is used to filter and block a small part of the small particle impurities present in the drip irrigation tape raw material after the primary filter unit 1 has filtered; it can be used for about 18 hours, and we usually replace it when the team changes shifts and stops; the secondary filter unit 2 includes a filter chamber 28 and a filter plate 29 located on the upper side of the filter chamber 28 and slidingly matched with the filter chamber 28; the secondary filter screen 32 is detachably matched with the filter plate 29 (can be bolted or snap-fitted), which is convenient for replacement when the team changes shifts and stops; a support frame 30 is vertically provided on the filter chamber 28, and a push rod 31 is provided on the support frame 30 (the push rod 31 can be any one of an air push rod 31, a hydraulic push rod 31, and an electric push rod 31); the push head of the push rod 31 is fixed to the filter plate 29, and the height position of the support frame 30 is changed by controlling the extension and shortening of the push rod 31, and the removal and retraction of the support frame 30 are controlled (the extension and shortening of the push rod 31 can be controlled by a button switch, etc., which is a prior art and will not be repeated here).

[0040] In order to ensure that the water-cooled extrusion head 3 can extrude evenly, a metering pump 33 is provided between the primary filtration unit 1 and the secondary filtration unit 2. The metering pump 33 is electrically connected to the control system 34 (the control system 34 is a single-chip microcomputer or a programmable controller PLC). A first pressure sensor 35 for detecting the pressure of the water-cooled extrusion head 3 is provided between the secondary filtration unit 2 and the water-cooled extrusion head 3. The first pressure sensor 35 is electrically connected to the control system 34. After transmitting the pressure signal to the control system 34, the metering pump 33 is adaptively adjusted by the control system 34 to keep the water-cooled extrusion head 3 at an even pressure. Considering that the replacement of the primary filter 20 currently depends entirely on manual experience, the impurity content of each batch of raw materials is also different, so the primary filter 20 is replaced. When changing, sometimes it is blocked for a long time, and sometimes it can continue to be used because there are fewer filtered impurities. At the same time, it is easy to forget to watch the machine manually on time. Therefore, a second pressure sensor 36 for detecting the primary filter 20 is provided on the filter tube 4. The second pressure sensor 36 and the drive device 6 are electrically connected to the control system 34 respectively. When impurities accumulate on the primary filter 20 and form an obvious blockage, the pressure of the second pressure sensor 36 increases. When it reaches the preset threshold, the drive device 6 on the working side is controlled to be closed and the rotor pump on the other side is turned on. When the pressure value of the second pressure sensor 36 is obtained, the drive device 6 of this system works in rotation, ensuring that the normal operation of the entire system is ensured while ensuring that the primary filter 20 reaches its usage limit before being replaced.

[0041] Unless otherwise specified above, the fixing methods generally used by those skilled in the art include welding, nesting, or threaded fixing.

[0042] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0043] The above-described embodiments of the present invention do not limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A drip irrigation tape extrusion double filtration system, characterized by: The system comprises a primary filtering unit (1) for coarsely filtering the melted drip irrigation tape raw material, and a secondary filtering unit (2) for finely filtering the melted drip irrigation tape raw material; and further comprises a heating device (37) for heating various components in the system; after the drip irrigation tape raw material is heated and melted by the melting furnace (9), it passes through the primary filtering unit (1) and the secondary filtering unit (2) and then passes through a water-cooled extrusion head (3); the primary filtering unit (1) comprises a filter tube (4) and a filter element assembly arranged in the filter tube (4); one side of the filter tube (4) is connected to a driving device (6) through an auxiliary tube (5); the driving device (6) is used to connect to the melting furnace (9) and drive the melted material inside to flow to the primary filtering unit (1); the other side of the filter tube (4) passes through the secondary filtering unit (2) and the water-cooled extrusion head (3) connection; the filter tube (4) includes an inlet tube (15) connected to the auxiliary tube (5) and a discharge tube (16) perpendicular to the inlet tube (15), and the inlet tube (15) and the discharge tube (16) are connected through a connecting block (17); a tapered mounting groove (18) corresponding to the inlet tube (15) is provided on the connecting block (17), and the discharge tube (16) is connected to the side of the mounting groove (18); the filter element assembly includes a filter head (19), a primary filter screen (20) and a filter screen bracket (21), the filter head (19) is a tapered structure corresponding to the mounting groove (18), and its side has a guide port (22) corresponding to the discharge tube (16), the filter screen bracket (21) is provided on the side corresponding to the filter head (19) and the inlet tube (15), and the primary filter screen (20) is an annular structure and is snap-fitted to the filter screen bracket (21).

2. A drip irrigation tape extrusion dual filtration system according to claim 1, characterized in that: A limiting slide shaft (23) is relatively provided in the auxiliary tube (5), and a limiting slider (24) is slidably matched with the limiting slide shaft (23). The limiting slider (24) extends out of the auxiliary tube (5) through an extension column (25) and is fixed to a connector (26); the connector (26) is detachably matched with the filter element assembly; the filter element assembly is linked to the limiting slider (24); when pulled out, the limiting slider (24) seals the end of the auxiliary tube (5), and the internal conduction is achieved when the filter element assembly is pushed in as a whole.

3. The drip irrigation tape extrusion dual filtration system according to claim 1, characterized in that: The secondary filter unit (2) comprises a filter chamber (28) and a filter plate (29) located on the upper side of the filter chamber (28) and slidingly engaged with the filter chamber (28); the secondary filter screen (32) is detachably engaged with the filter plate (29); a support frame (30) is vertically provided on the filter chamber (28), and a push rod (31) is provided on the support frame (30); a push head of the push rod (31) is fixed to the filter plate (29), and the height position of the support frame (30) is changed by controlling the extension and contraction of the push rod (31).

4. The drip irrigation tape extrusion dual filtration system according to claim 1, characterized in that: A metering pump (33) is provided between the primary filtration unit (1) and the secondary filtration unit (2), and the metering pump (33) is electrically connected to the control system (34). A first pressure sensor (35) for detecting the pressure of the water-cooled extrusion head (3) is provided between the secondary filtration unit (2) and the water-cooled extrusion head (3); the first pressure sensor (35) is electrically connected to the control system (34), and after transmitting a pressure signal to the control system (34), the control system (34) adjusts the self-adaptive metering pump (33) to maintain a balanced pressure in the water-cooled extrusion head (3).

5. The drip irrigation tape extrusion dual filtration system according to claim 1, characterized in that: The filter tubes (4) are each provided with a second pressure sensor (36) for detecting the primary filter screen (20); the second pressure sensor (36) and the drive device (6) are each electrically connected to the control system (34); when the pressure detected by the second pressure sensor (36) is greater than a threshold value, the control system (34) controls the drive device (6) on the working side to be turned off and the drive device (6) on the other side to be turned on.

6. A drip irrigation tape extrusion double filtration system, characterized by: The invention comprises a primary filtering unit (1) for coarsely filtering the melted drip irrigation tape raw material, and a secondary filtering unit (2) for finely filtering the melted drip irrigation tape raw material; and further comprises a heating device (37) for heating various components in the system; after the drip irrigation tape raw material is heated and melted by the melting furnace (9), it is filtered in sequence by the primary filtering unit (1) and the secondary filtering unit (2) and then passes through a water-cooled extrusion head (3); the primary filtering unit (1) is provided with two, which are respectively connected to the two ends of the inverter device (7), and the third end of the inverter device (7) is connected to the secondary filtering unit (2); the driving device (6) generates a linkage with the inverter device (7), and the inverter device (7) seals the unactivated side of the driving device (6); the other sides of the two first filtering units are respectively connected to the driving device (6) through the auxiliary pipe (5), and the two driving devices (6) are connected to the two sides of the three-way pipe (8), and the third end of the three-way pipe (8) is connected to the driving device (6). The filter unit (1) is connected to the melting furnace (9); the primary filter unit (1) includes a filter tube (4) and a filter element assembly arranged in the filter tube (4); the filter tube (4) includes an inlet tube (15) connected to the auxiliary tube (5) and a discharge tube (16) perpendicular to the inlet tube (15); the inlet tube (15) and the discharge tube (16) are connected through a connecting block (17); the connecting block (17) is provided with a tapered mounting groove (18) corresponding to the inlet tube (15); the discharge tube (16) is connected to the auxiliary tube (5) and the discharge tube (16) is connected to the auxiliary tube (5); the inlet tube (15) and the discharge tube (16) are connected to the auxiliary tube ( ... 6) is connected to the side of the installation groove (18); the filter element assembly includes a filter head (19), a primary filter screen (20) and a filter screen bracket (21); the filter head (19) is a tapered structure corresponding to the installation groove (18), and its side has a guide port (22) corresponding to the discharge pipe (16); the filter screen bracket (21) is provided on the side corresponding to the filter head (19) and the inlet pipe (15); the primary filter screen (20) is an annular structure and is snap-fitted to the filter screen bracket (21).

7. The drip irrigation tape extrusion dual filtration system according to claim 6, characterized in that: The inverter device (7) includes an inverter cylinder (10), an outlet end is formed in the middle of the inverter cylinder (10) for connecting to the secondary filter unit (2); both sides of the inverter cylinder (10) are respectively connected to the primary filter unit (1); a sealing block (11) is slidably connected inside the inverter cylinder (10); stop rings (12) are vertically provided on both sides of the inverter cylinder (10); the sealing block (11) is smaller than the inner diameter of the inverter cylinder (10); a sliding column (13) is horizontally provided inside the inverter cylinder (10), and a notch (14) corresponding to the sliding column (13) is provided on the sealing block (11), and the sealing block (11) is slidably limited in the inverter cylinder (10) through the sliding cooperation between the notch (14) and the sliding column (13).

8. The drip irrigation tape extrusion dual filtration system according to claim 7, characterized in that: Two sealing blocks (11) are provided, and the two sealing blocks (11) are connected via a spring (38).

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